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Table 3 Results of sample site comparisons in ICU patients and healthy volunteers

From: Validation of a point-of-care capillary lactate measuring device (Lactate Pro 2)

  Estimate (Ratio) 95% CI p-value
ICU patients
 Finger LP2.1 vs Arterial LP2.1 1.47 1.29 to 1.68 < 0.001
 Earlobe LP2.1 vs Arterial LP2.1 1.27 1.11 to 1.45 < 0.001
 Finger LP2.2 vs Arterial LP2.2 1.85 1.55 to 2.21 < 0.001
 Earlobe LP2.2 vs Arterial LP2.2 1.22 1.03 to 1.46 0.024
 Finger LP2.1 vs Venous LP2.1 1.14 1.01 to 1.30 0.040
 Earlobe LP2.1 vs Venous LP2.1 0.99 0.87 to 1.12 0.871
 Finger LP2.2 vs Venous LP2.2 1.43 1.20 to 1.69 < 0.001
 Earlobe LP2.2 vs Venous LP2.2 0.95 0.80 to 1.13 0.569
Healthy volunteers
 Finger vs arterial 1.14 1.04 to 1.24 0.003
 Earlobe vs arterial 0.98 0.90 to 1.06 0.568
  1. The results presented in the table are based on mixed effects models with log transformed lactate as the dependent variable. The ratios presented are based on fixed effect coefficients, exponentially transformed to be interpretable as ratios. For example, lactate measurements from the fingertip are estimated as 47% higher than arterial measurements in ICU patients